Willis,
The PhoneGap Application Project creation wizard only provides templates to choose from. Once the project is created, you need to edit the index.html and add your code accordingly in the header,content and footer sections.
What you are seeing in the Preview is the default content in the index.html.
<div data-role="content" >
<p>This is a single page boilerplate template that you can copy to build your first jQuery Mobile page.</p>
<canvas width="" height="300"></canvas>
</div><!-- /content -->
You need to add your content in the place of default content.
Hope this helps. Let us know if you have any questions.
–Swapna
MyEclipse Support